My first night in Paris was rainy and cold, so I hopped on the metro and explored the Lourve for a few hours. The museum is breathtaking and I don't think anyone would be able to spend enough time there to see everything. It's absolutely massive!
This is the only place in Europe I stayed in a hostel just because the AirBnbs were all so expensive.
With only one full day in Paris, I tried to check off the main attractions. The Eiffel tower in the morning, then I walked to the Tomb of Napoleon, and spent the rest of the day exploring based off recommendations of Google and locals. I ended the night watching the Eiffel Tower light up, and then walked along the Seine back to my hostel. I wish I had spent more time in Paris, but timing just didn't line up.
I took the train from Gare Du Nord straight to the Airport, which was a super easy commute.